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Additional Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Nov. 13, 2020
Dividends Payable [Line Items] |  |  |
Interest payments | $ 27 | $ 44 |
Income and withholding taxes paid | 17 | 20 |
Dividends paid | $ 62 | $ 206 |
Common Stock |  |  |
Dividends Payable [Line Items] |  |  |
Cash dividends declared (in dollars per share) |  |  | $ 0.12

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